feat(14-03): add EmailAlertAdapter generic extraction + 'email-alert' normalizer dispatch

GREEN phase (TDD) for Task 1: extractCandidateLinks (cheerio a[href] +
footer-noise filter + MAX_LINKS_PER_EMAIL cap, plaintext regex fallback),
titleFromEmail (subject -> first body line -> fallback), and
sourceNoticeIdFor (sha256 link hash) implement D-04's generic, no-portal-
specific-parser evaluation of alert emails.

SourceType gains 'email-alert'; TenderNormalizerService routes it through
the existing normalizeBag() path (same as ai-netserver/cosinex-dtvp/rss).
EmailAlertAdapter.fetchTenders() is a Task-1 placeholder — Task 2 wires the
real per-tenant fan-out.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/api/src/tenders/tender-normalizer.service.spec.ts

@@ -85,7 +85,9 @@ function bagRecord(
       ? 'cosinex-dtvp'
       : sourceType === 'rss'
         ? 'service-bund'
-        : 'tender24';
+        : sourceType === 'email-alert'
+          ? 'email-alert'
+          : 'tender24';
   return {
     sourceType,
     sourcePortal,
@@ -355,4 +357,40 @@ describe('TenderNormalizerService', () => {
       expect(normalized.title).toBe('Unbenannte Ausschreibung');
     });
   });
+
+  describe("'email-alert' sourceType (Phase 14, Plan 03, INGEST-05)", () => {
+    it('maps an email-alert bag through normalizeBag(): title passes through, cpvDivisions stays empty', () => {
+      const raw = bagRecord('email-alert', {
+        title: 'Vergabebekanntmachung: Straßenbauarbeiten Musterstadt',
+        buyerName: null,
+        procedureType: null,
+        legalFramework: null,
+        deadlineAt: null,
+      });
+
+      const normalized = service.normalize(raw);
+
+      expect(normalized.title).toBe(
+        'Vergabebekanntmachung: Straßenbauarbeiten Musterstadt',
+      );
+      expect(normalized.cpvDivisions).toEqual([]);
+      expect(normalized.cpvCodes).toEqual([]);
+      expect(normalized.region).toBeNull();
+      expect(normalized.bundesland).toBeNull();
+      expect(normalized.buyerName).toBeNull();
+      expect(normalized.procedureType).toBeNull();
+      expect(normalized.deadlineAt).toBeNull();
+      expect(normalized.dedupKey).toBe(
+        `${raw.sourcePortal}:${raw.sourceNoticeId}`,
+      );
+    });
+
+    it('email-alert title falls back to "Unbenannte Ausschreibung" when empty', () => {
+      const raw = bagRecord('email-alert', { title: '' });
+
+      const normalized = service.normalize(raw);
+
+      expect(normalized.title).toBe('Unbenannte Ausschreibung');
+    });
+  });
 });